370 TllKcol'SOKA 



The connection of the spore-forms on these two hosts lias heen experi- 

 mentally demonstrated by Klebahn, Tubeuf, and Fischer. The basidio- 

 spores in spring (about the time of pollination of the Fir) infect the female 

 tlowci's of the Spruce Fir, which are usually at the top of the high trees; 

 occasionally also the young shoots are affected, hut they do not produce 

 secidia. The secidia are developed in late summer, and mature on the 

 fallen cones: their spores germinate in the following -May, and then infect 

 the leaves of the Bird Cherry, on which they produce uredospores in the 

 summer and teleutospores in the autumn (Fischer, I.e. and Centralbl. f. 

 Bakter. 2, xv. 1906, p. 227). The description of the teleutospores is 

 taken from Klebahn and Fischer. As will he seen from the synonymy, 

 the secidium was originally classed among the Myxomycetes. The three 

 stages appear in Cooke's Handbook (according to the knowledge then 

 prevailing) on three different pages, the secidium from Appin, the uredo 

 from some place in Scotland, and the "Melampsora" from Swanscombe, 

 Kent (Cooke, 1865). It is also recorded on l\ Padus in Yorkshire Fung. 

 Fl. p. 184, while the secidium is recorded on "pine-cone scales" on p. 369. 

 The uredo has also been found at Braemar, Ahoyne, Perth, etc.; and the 

 secidium in Dumfriesshire. 



Distribution : Europe. 



2. Thecopsora Galii De Toni. 



Caeoma Galii Link, Sp. PL ii. 21. 



Melampsora Galii Wint. Pilze, p. 244. Plowr. Trans. Brit. Myc. Soc. 



i. 59. 

 Pucciniastrum Galii Fischer, Ured. Schweiz, p. 471, f. 307. 

 Thecopsora Galii De Toni in Sacc. Syll. vii. 765. 



Uredospores. Sori scattered or gregarious, small, round, 

 pulvinate, reddish, covered by the epidermis and by a peridium 

 which opens at the summit with a pore; spores shortly ellipsoid 

 or ovate, sparsely echinulate, orange-yellow, 17 — 20x14 — 16/x; 

 epispore colourless, without evident germ-pores. 



Teleutospores. Developed in the epidermal cells, forming 

 little dark-brown crusts, crowded, roundish, longitudinally 

 septate into 2 — 4 cells, 21 — 24x21 — 32 /a ; epispore rather 

 thick, yellowish-brown, smooth, with an evident germ-pore at 

 the upper and inner corner. 



On Galium verum (H. T. Soppitt), June — September, 1889. 

 Very rare. 



It is reported, in continental Europe, as occurring on other species 

 of Galium, also on Sherardia and Asperula. 



